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The interaction of cosmic radiation with terrestrial matter leads to the  in-situ  production of cosmogenic nuclides in the exposed surface material. Accelerator mass spectrometry (AMS) enables us to quantitatively measure trace concentrations of  in-situ  produced radionuclides like  10 Be and  26 Al.  21 Ne can be determined by conventional noble gas mass spectrometry. This ultimately allows the determination of surface exposure ages, erosion rates and other processes of landscape evolution. The availability of a pure and well defined mineral sample is an important prerequisite for surface exposure dating. As the samples taken in the field usually do consist of many different mineral components, a quartz separation technique has to be employed. We present a chemical mineral separation that allows the isolation of a pure quartz fraction, which is quantitatively decontaminated from the atmospheric  10 Be contamination lying on the sample.

Surface exposure dating by in-situ produced cosmogenic nuclides: chemical mineral separation of purified quartz